Help with sum of items

Hi All, I have the following for data: 03/14/2003,09:56:17,PTLD-TC1-HARC1,Stop,63.164.60.116,200,jsmith,9,24 3,271,15,User Request,2072280717,2073369937,46666BPS 03/15/2003,09:56:17,PTLD-TC1-HARC1,Stop,63.164.60.116,200,jsmith,9,24 3,271,15,User Request,2072280717,2073369937,46666BPS 03/16/2003,09:56:17,PTLD-TC1-HARC1,Stop,63.164.60.116,200,jsmith,9,24 3,271,15,User Request,2072280717,2073369937,46666BPS 03/17/2003,09:56:17,PTLD-TC1-HARC1,Stop,63.164.60.116,200,jwgreene,9,24 3,271,15,User Request,2072280717,2073369937,46666BPS What I need to do is the following: Take the value of a specific entry (15 in the above data) and add each instance so I have a total of all the entries... I am assuming that I would take the line, split it, assign each item to a variable and then I would be able to do something with a while statement, but I am not really sure what in php. Any help would be appreciated. Thanks Jim